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Business Segments - Schedule of Information on Company's Business Segments (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018 | Dec. 31, 2018
Segment Reporting Information [Line Items] |  |  |  |  |
Net sales | $ 624,246 | $ 622,888 | $ 1,888,576 | $ 1,869,572 |
Operating income | 141,765 | 145,133 | 444,830 | 429,647 |
Interest expense | 11,330 | 10,958 | 33,262 | 33,098 |
Other (income) expense - net | 1,219 | 934 | 701 | (3,565) |
Income before income taxes | 129,216 | 133,241 | 410,867 | 400,114 |
Total assets | 3,713,895 |  | 3,713,895 |  | $ 3,473,857
Intersegment elimination |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Net sales | (768) | (583) | (2,894) | (983) |
Corporate office |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating income | (17,853) | (18,492) | (55,659) | (61,183) |
Total assets | 269,717 |  | 269,717 |  | 230,637
Fluid & Metering Technologies |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Net sales | 240,758 | 239,119 | 729,205 | 714,135 |
Operating income | 77,481 | 69,755 | 223,493 | 207,149 |
Fluid & Metering Technologies | Intersegment elimination |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Net sales | 103 | 94 | 367 | 211 |
Fluid & Metering Technologies | Operating Segments |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Net sales | 240,861 | 239,213 | 729,572 | 714,346 |
Total assets | 1,121,170 |  | 1,121,170 |  | 1,107,777
Health & Science Technologies |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Net sales | 228,988 | 222,351 | 685,848 | 670,685 |
Operating income | 40,170 | 49,144 | 151,087 | 153,519 |
Health & Science Technologies | Intersegment elimination |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Net sales | 622 | 75 | 1,305 | 219 |
Health & Science Technologies | Operating Segments |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Net sales | 229,610 | 222,426 | 687,153 | 670,904 |
Total assets | 1,510,210 |  | 1,510,210 |  | 1,329,368
Fire & Safety/Diversified Products |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Net sales | 154,500 | 161,418 | 473,523 | 484,752 |
Operating income | 41,967 | 44,726 | 125,909 | 130,162 |
Fire & Safety/Diversified Products | Intersegment elimination |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Net sales | 43 | 414 | 1,222 | 553 |
Fire & Safety/Diversified Products | Operating Segments |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Net sales | 154,543 | $ 161,832 | 474,745 | $ 485,305 |
Total assets | $ 812,798 |  | $ 812,798 |  | $ 806,075

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